[meford4u]

The problem with stain protectors is they fail very quickly, especially in a car where you are rubbing the fabric everytime you enter and exit the vehicle.
My experience with the fabric in the Focus is that it is very easily cleanable with a steam cleaner.
With a child in the rear seat, just the addidtion of a towel under their seat or even a seat cover from Can. Tire would do the trick.
I know that doesn't exactly answer your question, but if your keen on using a fabric protector, they are all very similar products and need to be re-applied often (I would say bi-weekly with a kid)
But another question is are they safe for kids? I don't know that answer.

With the child crawling in and out of the car, you may want to look at the fact the product will be coming off onto your child's hands. Just a thought(although a scarey one at that)